盾构穿越邻近基坑锚索群施工方案比选与优化  

Comparison and Optimization of Techniques About Constructing the Anchor Cable Groups by Piercing the Shield into the Adjacent Foundation Pits

作　　者：胡军 HU Jun(China Railway 14th Bureau Group Tunnel Engineering Co.Ltd.,Jinan Shandong 250013,China)

机构地区：[1]中铁十四局集团隧道工程有限公司,山东济南250013

出　　处：《铁道建筑技术》2024年第6期132-135,174,共5页Railway Construction Technology

基　　金：山东省自然科学基金(ZR2020QE265)。

摘　　要：盾构施工不可避免会穿越各类建(构)筑物及地下障碍物,而道路两侧既有高楼基坑围护结构多采用锚索支护,锚索长度与基坑深度、水文地质情况密切相关。基坑施工完毕后锚索一般永久存留于地层中,给盾构施工安全带来挑战。盾构穿越锚索群施工相关处理措施,需根据实际水文地质条件、锚索设计施工情况、周边工程环境等综合确定。本文结合某软弱富水地层盾构施工为背景,提出几种不同处理方案并从施工效果、施工风险、工期与经济性等方面进行方案比选;对盾构机穿越锚索区域施工方案进行针对性优化设计,锚索区域预留常压开仓条件,盾构顺利穿越锚索区域,实现了对环境影响小、施工成本低的目的。It is unavoidable that various buildings and underground obstacles have to be pierced due to the application of the shield.Usually,the foundation pits′supporting structure applies cable bolting where tall buildings have been finished on the both sides of the road.And the length of that cable bolting is closely related to the depth of the pits and the hydrogeology conditions.Many challenges arise from the cable bolting that is usually left in the ground after completing the foundation pits.And the solutions to these challenges mainly depend on actual hydrogeology conditions,the cable bolting design and construction situations,and the surrounding engineering environment.On the basis of the shield tunneling construction in a watery and weak stratum,this paper puts forward several different ways to deal with the cable bolting,and compares them from the aspects of construction effect,construction risk,construction period,and economy.With shield′s targeted and effective design for the construction plan and anchor area′s proper opening conditions under normal pressure in place,the anchor area can be directly pierced by the shield,minimizing its environmental impacts and decreasing the cost.

关 键 词：盾构施工 富水软弱地层 锚索群 方案比选与优化 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]